Agreed that you should have a minimum altitude. 1000' AGL can be reasonable over level terrain when there's airports about, but you'd want more over hostile terrain and a generous allowance for any possible towers.
More important than the forecast for the trip out is the forecast for the trip back -- get home-itis is a serious killer, especially as the cure can entail major inconvenience.
It really helps to look at the synoptic charts to have an idea for how the weather will develop.